www.gusucode.com > symbolic 源码程序 matlab案例代码 > symbolic/AddTitleAndAxisLabelsAndFormatTicks3DImplicitEquationExample.m

    %% Add Title and Axis Labels and Format Ticks
% Plot the implicit equation $x \sin(y) + z \cos(x) = 0$ over the interval $(-2\pi, 2\pi)$ for all axes.
% 
% Create the x-axis ticks by spanning the x-axis limits at intervals of
% |pi/2|. Convert the axis limits to precise multiples of |pi/2| by using
% |round| and get the symbolic tick values in |S|. Display these ticks by using the
% |XTick| property. Create x-axis labels by using
% |arrayfun| to apply |texlabel| to |S|. Display these labels
% by using the |XTickLabel| property. Repeat these steps for the y-axis.
% 
% To use LaTeX in plots, see <docid:symbolic_ug.f2-234358>.

syms x y z
eqn = x*sin(y) + z*cos(x);
fimplicit3(eqn,[-2*pi 2*pi])
title('xsin(y) + zcos(x) for -2\pi < x < 2\pi and -2\pi < y < 2\pi')
xlabel('x')
ylabel('y')
ax = gca;

S = sym(ax.XLim(1):pi/2:ax.XLim(2));
S = sym(round(vpa(S/pi*2))*pi/2);
ax.XTick = double(S);
ax.XTickLabel = arrayfun(@texlabel,S,'UniformOutput',false);

S = sym(ax.YLim(1):pi/2:ax.YLim(2));
S = sym(round(vpa(S/pi*2))*pi/2);
ax.YTick = double(S);
ax.YTickLabel = arrayfun(@texlabel, S, 'UniformOutput', false);